.triangle(@_,@_,@_) {
  width: 0px;
  height: 0px;
  overflow: hidden;
}

.triangle(L,@w,@c) {
  border-width: 40px;
  border-style: dashed solid dashed dashed;
  border-color: transparent @c transparent transparent;
}

.triangle(R,@w,@c) {
  border-width: 40px;
  border-style: dashed dashed dashed solid;
  border-color: transparent transparent transparent @c;
}

.triangle(T,@w,@c) {
  border-width: 40px;
  border-style: dashed dashed solid dashed;
  border-color: transparent transparent @c transparent;
}

.triangle(B,@w,@c) {
  border-width: 40px;
  border-style: solid dashed dashed dashed;
  border-color: @c transparent transparent transparent;
}
